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LL,
The difference between the race H-pipe and the performance H- pipe version that MRT offers is the type of material used in the catalytic converters . Race has a metallic catalysts while the performance version uses ceramic material.

I had installed a larger mid pipe on my 04 Mach in preparation of running a supercharger, and could definitely tell a seat of the pants difference in the way the car ran .

I will be buying a larger diameter h-pipe for the boss for sure. I think , there is some power to be had with that mod. Unlike axle backs , which are more a choice of sound , than for power gains.

LL,The difference between the race H-pipe and the performance H- pipe version that MRT offers is the type of material used in the catalytic converters . Race has a metallic catalysts while the performance version uses ceramic material.

I had installed a larger mid pipe on my 04 Mach in preparation of running a supercharger, and could definitely tell a seat of the pants difference in the way the car ran .

I will be buying a larger diameter h-pipe for the boss for sure. I think , there is some power to be had with that mod. Unlike axle backs , which are more a choice of sound , than for power gains.

There is not much to gain in the exhaust until you up the horsepower with a power adder. Then you really need to change out the whole exhaust starting with long tube headers. For the stock Boss engine, changing anything in the exhaust is not going to net you very much, maybe 5 hp and 5 tq at the most. The thing is that the stock exhaust system flows pretty good for what the stock engine needs. Once you force more air and fuel down its throat is when you need to open up the exhaust.

Like NOSBOSS said, axel backs won't give you anything at all, just a different sound. So if I was adding a Turbo or S/C, or Nitrous, I would do long tube headers with 1-3/4 primaries (hopefully 4" collectors), 3" X-pipe (with or without cats), and keep the rest of it 3" or better to the back of the car. If you live in an area like I do where we must pass emissions each year, I would have to have cats. I tried one year to pass emissions with steel hi flow cats and the car wouldn't pass. I've used ceramic hi flow cats and it passed. Keep us informed on what you do.